In order to work, Keystroke's Stock Number CheckSum feature must be enabled (commonly referred to as being turned ON) in two places:
1- To print Price Tags with Stock Number CheckSums, the Add Checksum Digit Flag must be enabled.
2- To correctly read Stock Numbers with CheckSum digits, the Stock Number CheckSum Line Item Entry Parameter must be enabled.
See:
Stock Number CheckSum Line Item Entry Parameter
What is a CheckSum and why use one?
Stock Number CheckSum Examples
Add Stock Number CheckSum Digit Flag
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